Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Live Chat by Landbot - Live chat that combines chatbots with human chat

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

GoSquared Live Chat - Beautiful, simple, and free live chat for your website

Bigtent - BigTent is a web-based organization and communication portal for groups.